31. Acompany's two divisions performed with remarkable consistency over the past three years: in each of those years, thepharmaceuticals division hasaccounted for roughly 20percent of dollar sales and40 percent of profits,and the chemicals division forthe balance.

Which of the following can properly be inferred regarding the past three yearsfrom the statement above?

A        Total dollar sales for eachof the company‘s divisions have remained roughly constant.

B        The pharmaceuticalsdivision has faced stiffercompetition in its markets thanhas the chemicals division.

C        The chemicals divisionhas realized lower profitsper dollar of sales thanhas the pharmaceuticalsdivision.

D        The product mix offeredby each of the company's divisions hasremained unchanged.

E        Highly profitable productsaccounted for ahigher percentage of thechemicals division‘s sales than those of the pharmaceuticalsdivision's.

看了之前的讨论帖，还是不是很明白remarkable consistency和the balance的关系，求题干的中文解释，以及相应的解题思路。

为什么看到the balance就应该用100%去减呢？